Onderzoek naar ‘dingen zien die er niet zijn’ bij psychotische aandoeninge
Recruiting
- Conditions
- Visual hallucinations in psychotic disorders
- Registration Number
- NL-OMON27034
- Lead Sponsor
- niversity Medical Center Groningen
- Brief Summary
Not available
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- Recruiting
- Sex
- Not specified
- Target Recruitment
- 51
Inclusion Criteria
Patients must fulfill the following criteria:
1) meeting DSM-IV criteria for schizophrenia, schizophreniform disorder or schizoaffective disorder;
2) age between 18-55;
3) speaking Dutch fluently;
4) being able to give informed consent.
Healthy controls must fulfill the following criteria:
Exclusion Criteria
Exclusion criteria are:
1) other psychiatric disorders than schizophrenia;
Study & Design
- Study Type
- Observational non invasive
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method The primary endpoint is visual perception, assessed by The Visual object and Space Perception Battery (VOSP), which comprises four tests designed to assess object perception and four tests for space perception. <br /><br>Visual perception is also assessed by the Image Recognition Movies task (IRM). This test compromises 4 movies in which objects dynamically appear out of random noise, mimicking suboptimal visual situations.
- Secondary Outcome Measures
Name Time Method The secondary objective is attention. The subtest ‘Vigilance’ of the Test battery of Attentional Performance (TAP) (21) was applied for this objective. <br>An other type of attention (working memory) is also assessed by the Wechsler Adult Intelligence Scale (WAIS) III Word Learning and Recalling Task. <br /><br>An other secondary objective is auditory perception. A speech discrimination test has been applied for this objective. <br><br /><br /><br>Patients with visual hallucinations are interviewed about these hallucinations, using ‘De Visuele Hallucinatie Vragenlijst’ (in English: 'The Visual Hallucination Questionnaire'); which is based on the 'Institute of Psychiatry Visual Hallucinations Interview'.